2003 Toyota 4Runner car won't start

the other day my car wouldn't start. I turned the key and the air and radio came on. No other sound other than an almost inaudible humming. I tried to start it around 25 times and on the 26th it started. No problem since then. Noticed the battery fluid was low. Changed the battery. But is there probably another problem?

I am sorry but I cannot make a donation. that is why I came here. for free info. please help me if you can. than you. chey